Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets, net of amortization	$ 22,002	$ 0
Financing lease right-of-use assets, net of amortization	8,618	0
Total assets	30,620
Current portion of operating lease liabilities	5,595	0
Current portion of financing lease liabilities	2,875	0
Total current	8,470
Operating lease liabilities	17,109	0
Financing lease liabilities	4,862	$ 0
Total noncurrent	21,971
Total liabilities	30,441
Operating lease, right-of-use asset, accumulated amortization	1,400
Finance lease, right-of-use asset, accumulated amortization	$ 4,500